Benzothiadiazine derivatives



ignited States atent O 3,004,024 BENZOTHIADIAZINE DERIVATIVES Jack Bernstein and Harry Louis Yale, New Brunswick, 1Y1, assignors to Olin Mathieson Chemical Corporatron, New York, N.Y., a corporation of Virginia .No Drawing. Filed Apr. 10, 1959, Ser. No. 805,374 Claims. (Cl. 260-243) This invention relates to new dihydrobenzothiadiazine derivatives, and more particularly to new trifluoromethyldihydrobenzotiiadiazinesulfonarnide derivatives of the general formula as well as the alkali metal salts thereof, wherein the Rs are the same or different and represent hydrogen, lower alkyl or aryl or less than twelve carbon atoms, the R are the same or different and represent hydrogen, lower alkyl, phenyl or benzyl, Y is lower alkylene or phenylene, and n is zero or one. [By aryl is meant hydrocarbon aromatic radicals of less than twelve carbon atoms, such as phenyl, tolyl, xylyl and naphthyl, as well as simply substituted derivatives thereof, such as halo derivatives (e.g. the chlorphenyls and bromphenyls), nitro derivatives (e.g. 4-nitr0phenyl), amino derivatives (e.g. 4-aminophenyl), sulfamyl derivatives, and lower alkoxy derivatives (e.g. anisyl and the dimethoxy derivatives of phenyl).]

The new-dihydrobenzothiadiazines of this invention are physiologically active compounds which possess both diuretic and anti-hypertensive activities. Thus, these compounds are administrable parenterally and (preferably) orally in the treatment of congestive heart failure, being uniquely suitable for the treatment of this and other conditions where both the diuretic and anti-hypertensive activities are desirable.

The compounds of this invention are prepared by the process of this invention which essentially comprises heating a compound of the general formula SOzNHR RNHSO wherein R, Y and n are as hereinbefore defined, and X is halo (e.g. bromoand chloro) or lower alkoxy (e.g. methoxy and ethoxy) or together the Xs are keto (oxo). The reaction is preferably conducted employing not more than one mole of the carbonyl compound for every two moles of the disulfonamide.

Suitable carbonyl reactants include the lower alkanedials, such as glyoxal, succinaldehyde, glutaraldehyde and adipaldehyde; lower ketoalkanals, such as pyruvic aldehyde; lower alkanediones, such as diacetyl and acetylacetone; benzoyl-lower alkanals, such as phenyl glyoxal and B-benzoylpropionaldehyde; phenacetyl-lower alkanals such as ,B-phenacetylpropionaldehyde; dibenzoyllower alkanes, such as dibenzoylrnethane and 1,2-dibenzoylethane; diphenacetyl-lower alkanes, such as 1,5-diphenyl-2,4-pentanedione and 1,6-diphenyl-2,5-hexanedione; phthalic aldehydes, such as terephthalic aldehyde; and phenylene-di-lower alkanones, such as 1,3-diacetylbenzene and 1,4-diacetylbenzene; the tetra-(lower alkyl) acetal and ketal derivatives thereof, such as 1,l,3,3-tetramethoxypropane, 1,1,4,4-tetraethoxybutane, and 2,2,33- tetramethoxybutane; and the tetrahalo derivatives thereof, such as l,1,3,3-tetrabromopropane.

Suitable disulfonamide reactants can be prepared 19, 1959, and Serial No. 794,262, filed February 19, 1959, and specifically include 5-amino-u,a,a-trifluoro-2,4-toluenedisulfonamide, 4-amino-a,a,a-trifluoro-3,5-toluenedisulfonamide, 2-amino-a,a,a-trifiuoro-3,5-toluenedisulfonamide; the monoand di-lower alkyl derivatives thereof (i.e. those compounds wherein one or both Rs are lower alkyl), such as the monoand di-methyl, ethyl, and proas the monoand di-phenyl, p-chlorophenyl, m-tolyl, and p-methoxyphenyl derivatives thereof; and the lower alkyl, aryl derivatives thereof (i.e. those compounds wherein one R is lower alkyl and the other R is an aryl radical of less than twelve carbon atoms).

When an aldehyde, ketone, acetal or ketal is employed as the reactant the process is preferably carried out in The following examples illustrate the invention (all I temperatures being in centigrade):

EXAMPLE 1 3,3-ethylenebis-(3,4-a'ihydro-6-triflu0romethyl-I,2,4- benzothiadiazine-7-sulf0namide 1,1-di0xide) 40 A mixture of 31.9 g. (0.1 mole) of S-amino-a,oa,a-tri fluoro-2,4-toluenedisulfonamide and 4.3 g. (0.05 mole) of succinaldehyde in 250 ml. of 95% ethanol and 25 ml. of 10% aqueous hydrochloric acid is refluxed for 4 hours. The alcohol is then distilled from the reaction mixture of 20% aqueous hydrochloric acid plus 100 ml. of alcohol, the alcohol being allowed to distill slowly from the flask. The residue, which crystallizes, is filtered and washed with ether.

about 10% water. The product thus obtained melts at about 257-259 with decomposition.

EXAMPLE 2 Tetrapotassium salt of 3,3-ethylenebis-(3,4-dihydro-6-trifiuoromethyl-1,2,4-benz0thiadiazine-7-sulfonamide 1,1-

dioxide) benzothiadiazine-7-sulfonamide 1,l-di0xide).

Similarly, using the equivalent quantity of sodium hydroxide instead of potassium hydroxide in the procedure 7 of Example 2, the tetrasodium salt is obtained. Further more, if only 3.3 g. of potassium hydroxide is used in Example 2, the dipotassium salt is obtained.

Patented Oct. 10, 1961 as" disclosed in our applications, Serial No. 698,377, filed November 25, 1957, Serial No. 794,247, filed Februarypyl derivatives thereof; the monoand di-aryl derivatives thereof (i.e. those compounds wherein one or both R's are aryl radicals of less than twelve carbon atoms), such and the residue warmed on a steam bath with 25 ml.

The solid, which weighs about 20- g. is recrystallized twice from acetonitrile containing The resulting alcoholic solution is concentrated in vacuo to yield the tetrapotassium salt of 3,3'-ethylenebis-(3,4-dihydro-6-trifiuoromethyl 1,2,4-

3 EXAMPLE. 3

3,3 '-ethylenebis- (3 ,4 -dihydro-7-triflu0rom ethyl-I ,2,4,- benzthiadiazine-7-sulfonamide 1,1-di0xia'e) Following the procedure of Example 1, but substituting 31.9 g. of 4-amino-a,a,a-trifluoro,-3,S-toluenedisulfonamide for the 5amino-a,q,a-trifiuoro-2,4-toluenedisulfonamide, 3,3'-ethylenebis-(3,4-dihydro 7 trifiuoromethyl-1,2,4-benzothiadiazine-5-sulfonamide 1,1-dioxidc) is;- obtained.

EXAMPLE 4 3,3 ethylenebis-(3,4-dihydr0-5-trifluoromethyl-2,4- benzothiadiazine-7-sulf0namide I ,1 -di0xide Following the procedure of Example 1, but substituting 31.9 g. of 2-amino-ot,a,a-trifluorov-3,5rtoluenedisulfonamide for the 5-aminoa,ot,u-trifiuoro-2,4-toluenedisulfcnamide, 3,3-ethylenebis-(3,4-dihydro- 5;- trifluoro-v methyl-1,2,4-benzothiadiazine-7-sulfonamide; LL-dioxide) iszobtained.

EXAMPLE, 5. 3,3-'tetramethylenebis-(3,4-dihydr0-6 triflt4or0methyl- 1,2,4-benz0thiadiazine-7-sulf0namide 1,1-dioxide) Following the procedure of Example 1, but substituting;5.7 g, of adipaldehyde for the succinaldehyde, there is obtained 3,3-tetramethylene-bis-(3-,4-dihydro-6-trifiuoromethyl-1,2,4-benzothiadiazineJ-sulfonamide; Ll-CliOX-E V ide).

EXAMPLE 65 3, 3-bis-(3,4-dihydroe3-methyl-6-triflitoromethyl-1,2,4- benz thiadiazine-7-sulfonamide 1,,1-di0xide) Following the procedure of. Example 1, but substituting 4.3 g. of diacetyl for the succinaldehyde, there is ob,- tained 3 ,3 -bis- 3 ,4-dihydro-3methyl-6-trifiu0romethyl,1 2,4-benzothiadiazine-7-sulfonarnide l,1rdioxide).

Similarly, by substituting an, equivalent amount of glyoxal, glutaric aldehyde and pyruvic aldehyde for the succinaldehyde in Example 1, 3,3'-bis-(3,4-dihydro-6-trifluorornethyl-l,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide) 3,3 '-trimethylene-bis- 3 ,4-dihydro-6,-trifluoromethyl- 1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide), and 3- methyl 3,3 bis (3,4 dihydro 6 trifluoromethyl- 1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide) are obtained, respectively.

EXAMPLE 7 3,3 ethylenebis (3,4 dihydro N,2 -.dimethyl 6 trifluoromethyl 1,2,4 benzothiadiazine 7 sulfonamide Ll-dioxide) Following the procedure of Example 1' but substituting 34.7 g. of 5-amino-m,a,a-trifiuoro-N,N-dimethyl-2,4'

toluenedisulfonamide for the 5-amino-ot,a,a-trifiuoro-2,4-.

EXAMPLE 8.

3,3'-ethylenebis-(3,4 dihydro N,2 diphenyl-ti trifluoromethyl-1,2,4-benzothiadiazine-7-sulf0namide 1,1-dz'oxide) Following the procedure of Example 1, but substitut- 4 ing,47.1 g. of 5-a1T1lI10-0t,0t,0t-tllfll.lOIO-N,N'-diPh6llYl-2,4- toluenedisulfonamide for the 5-a[1lll10-tx,ot,Ot-IIlfiUOlO-2,4- toluenedisulfonarnide, there is obtained 3,3-ethylenebis- (3,4 dihydro N,2 diphenyl 6 trifiuoromethyl 1,2, 4-benzothiadiazine-7-sulfonamide 1,1-dioxide).

Similarly, by substituting an equivalent amount of,2 amino 4 trifiuoromethyl 5 (N phenylsulfamyl)- benzenesulfonamide, S-aminow s,u-trifiuoro-N,N'-di-4'- chlorophenyl-Z,4-toluenedisulfonamide and 5-arnino-a,a, u-trifluoro-N,N'-di-4-methoxyphcnyl 2,4- toluenedisulfouamide for the 5amino-ix,a,a-trifiuoro-2,4-toluenedisulfonamide in Example 1, there is obtained 3,3'-ethylencbis (3,4 dihydro N phenyl 6 trifluoromethyl 1,2, 4-benzothiadiazine-7-sulfonamide 1,1-dioxide) 3,3 -ethyl enebis (3,4 dihydro N,N' di 4' chlorophenyl 6- trifluoromethyl-l,2,4-benzothiadiazine-7-sulfonamide 1,1- dioxide) and 3,3,-ethylenebis (3,4 dihydro-N,N'-di-4'- methoxyphenyl 6 trifiuoromethyl 1,2,4 benzothiadiazine 7-sulfonamide 1,1-dioxide), respectively.

EXAMPLE 9 3,3'-ethylenebis-(3,4-a'ihydro-6 trifluoromethyl l,2,4- benzothiadiazine-7-sulf0namide 1 ,I-dioxide) A mixture of 319g. (0.1 mole).of 5amin0-ot,a,oc-ttifiuoro-2,4-toluenedisulfonamide and 11.7 g. of 1,1,4,4- tetraethoxybutane in 250 ml. of ethanol and 25 ml. of, 20% aqueous hydrochloric acid is refluxed for eight hours. The alcohol is then distilled from the reaction mixture and the crystalline residue is filtered. The crude product, after air-drying, is washed with ether and recrystallized from aqueous acetonitrile to give the desired product, melting at about 256-259, with decomposition.

EXAMPLE l0 3,3'-metfiylene5is-(3,4-dihydr0-6=trifluoromethyl-1,2,4- benzothiadiazine-7-sulf0namide 1 ,1 -di0xide) Following the procedure of Example 9 but substituting 8.2 g. of 1,1,3,3-tetramethoxypropane for the l,1,4,4- tetraethoxybutane, 3,3-methylenebis-(3,4-dihydro-6-trifluoromethyl-l,2,4-benzothiadiazine-7-sulfonamide 1,l'dioxide) is obtained.

EXAMPLE 11 3,3'-p-phenylene-bis-(3,4-dihydro-6JrifluommcthyI-I,2,4- benzothiadiazine-7-sulfonamide 1,1-dioxide) A mixture of 31.9 g. of 5-amino-u,a,a-trifiuoro-2,4- toluene-disulfonamide, 6.7 g. of terephthalic aldehyde, 1 g. of p-toluenesulfonic acid and 200 ml. of ethoxyethanol is refluxed for 24 hours, treated with decolorizing carbon and then diluted with 300 ml. of water. The precipitate is filtered, washed with water and recrystallized from acetonitrile to give the desired 3,3'-p-phenylene-bis-(3,4- dihydro-6-trifiuoromethyl-1,2,4-benzothiadiazine 7 sulfonamide 1,1 -dioxide).

EXAMPLE 12 3,3'-methylenebis (3,4-dihydro 6 trifluor0methyl-1,2,4- benzothiadiazine-7-sulf0namide 1,1di0xide) A mixture of 79.5 g. of S-amino-a,a,a-trifiuoro'2,4- toluenedisulfonamide, 45.0 g. of l,1,3,3-tetrabromopropane, 39.5 g. of anhydrous potassium carbonate and 250 ml. of dimethylformamide is stirred for one hour at 100. The mixture is then treated with a solution of 16 g. of potassium hydroxide in 20 ml. of water and heated an additional hour at The mixture is then concentrated in vacuo from the steam bath and the residue dispersed into 500 ml. of Water. The dispersion is then made acidic with dilute aqueous hydrochloric acid, heated on a steam bath for about two hours and cooled to give, 3,3- methylenebis-(3,4-dihydro-6-trifluoromethy1 1,2,4 benzothiadiazine-7-sulfonamide 1,1-dioxide) EXAMPLE 13 3,3-m-ethylenebis(3,4-dihydr0-3 benzyl-6-triflu0romethyl- 1,2,4-benz0thiadiazine-7-sulfonamid'e 1 ,1 -dioxid e) EXAMPLE 14 3,3-ethylenebis-(3,4-dihydro 3-benzyl-6-triflu0r0methyl- 1,2,4-benzothiadiazineJ-sulfonamide 1,1 -di0xide) Following the procedure of Example 13 but substituting 26.6 grams of 1,6-diphenyl-2,S-hexanedione for the 1,S-diphenyl-Z,4pentanedione, there is obtained 3,3'-ethylenebis-(3,4-dihydro-3-benzyl 6 trifluoromethyl-1,2,4- benzothiadiazine-7-sulfonamide 1,1-dioxide).

The invention may be variously otherwise embodied within the scope of the appended claims.

What is claimed is:

1. A compound selected from the group consisting of dihydrobenzothiadiazines of the formula and alkali metal salts thereof, wherein each R is selected from the group consisting of hydrogen, lower alkyl, phenyl, lower alkyl phenyl, chlorphenyl, bromphenyl, nitrophenyl, lower alkoxy phenyl and sulfamylphenyl; each R is selected from the group consisting of hydrogen, low- SOzNHR 6 er alkyl, phenyl and benzyl; Y is selected from the group consisting of lower alkylene and p-phenylene, and n is selected from the group consisting of zero and one.

2. 3,3'-lower alkylene-bis-(3,4-dihydro-trifiluoromethyl- 1,2,4-benzothiadiazine-sulfonamide 1,1-dioxide).

3. 3,3-lower alkylene-bis-(3,4-dihydro-6-trifluoromethyl-l,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide).

4. 3,3'-ethylenebis-(3,4-dihydro-6-trifluoromethyl 1,2, 4-benzothiadiazine-7-sulfonamide 1,1-dioxide).

5. 3,3'-l0wer alkylene-his-[3,4-dihydro N,2 di (lower alkyl)-6-t1ifluoromethy1-1,2,4-benzothiadiazine 7 sulfonarnide 1,1-dioxide].

6. 3,3-ethylenebis-(3,4-dihydro-N,2-dimethyl 6 trifiuoromethyl-1,2,4-benzothiadiazine-7sulfonamide 1,1-dioxide).

7. 3,3-ethylenebis-(3,4-dihydro N,2 diphenyl-6-trifluoromethyl-1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide).

8. 3,3'-bis-[3,4-dihydro-trifluoromethy1 3 (lower alkyl)-1,2,4-benzothiadiazine-sulfonamide 1,1-dioxide].

9. 3,3'-bis-(3,4-dihydro-3-methyl 6 trifluoromethyl- 1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide).

10. 3,3-p-phenylene-bis-(3,4 dihydro-G-trifluoromethyl-1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide).

References Cited in the file of this patent UNITED STATES PATENTS Novello Oct. 8, 1957 De Stevens July 14, 1959 OTHER REFERENCES 

1. A COMPOUND SELECTED FROM THE GROUP CONSISTING OF DIHYDROBENZOTHIADIAZINES OF THE FORMULA 